TW201234905A - Downlink flow control using packet dropping to control transmission control protocol (TCP) layer throughput - Google Patents

Abstract

Certain aspects of the present disclosure relate to wireless communications and methods and apparatus for downlink flow control at a user equipment (UE). Aspects generally include monitoring, by a UE, one or more parameters related to the UE, and selectively dropping received packets based on the one or more parameters in order to trigger a rate control mechanism. Selectively dropping received packets may occur at a Packet Data Convergence Protocol (PDCP) layer in order to reduce a corresponding transmission control protocol (TCP) throughput. Accordingly, packets may be selectively dropped prior to reaching an applications processor.

Description

201234905 VI. INSTRUCTIONS: CROSS-REFERENCE TO RELATED APPLICATIONS This application is hereby incorporated by reference in its entirety the entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire content In this article. TECHNICAL FIELD OF THE INVENTION The various aspects of the present invention relate generally to wireless communications, and more particularly to downlink flow control based on restrictions at user equipment (UE). [Prior Art] Wireless communication systems are widely deployed to provide various types of communication contents such as voice, materials, and the like. Such systems may be multiplexed access systems capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth and transmit power). Examples of such multiplex access systems include code division multiplex access (CDMA) systems, time division multiplex access (TDMA) systems, frequency division multiplex access (FDMA) systems, and third generation partnership programs ( 3 (5ρΡ) Long Term Evolution (LTE) system and Orthogonal Frequency Division Multiple Access (〇FDMA) system. Generally, a wireless multiplex access communication system can simultaneously support communication of multiple wireless terminals. The transmissions on the forward and reverse links communicate with one or more base stations. The forward link (or downlink) represents the communication link from the base station to the terminal' and the reverse link (or uplink) Road) represents the communication link from the terminal to the base station. Such forward link communication and reverse link communication links can be single-input single-output, multi-input single-output or

S 4 201234905 Multiple Input Multiple Output System to build. The wireless multiplex access communication system can support time division duplex (TDD) and frequency division duplex (FDD) systems. In a TDD system, both forward and reverse link transmissions are on the same frequency region, so mutual principles allow the forward link channel to be estimated from the reverse link channel. Thus having multiple antennas available at the access point enables the access point to extract transmit beamforming gain on the forward link. 3GPP LTE represents a major advance in cellular technology and is the next step in the evolution of Honeycomb Third Generation (3G) services as a Global System for Mobile Communications (GSM) and Universal Mobile Telecommunications (UMTS). LTE provides uplink speeds of up to 75 megabits per second (Mbps) and downlink speeds of up to 300 Mbps, and brings many technical benefits to the cellular network. LTE is designed to meet carrier demand for high-speed data and media transport as well as high-capacity voice support. The bandwidth can be scaled from 1.25 MHz to 20 MHz. This approach caters to the requirements of different network service providers with different bandwidth allocations and also allows service providers to offer different services based on spectrum. It is also expected that LTE will improve the spectral efficiency in 3G networks, allowing carriers to provide more data and voice services at a given bandwidth. The physical layer (PHY) of the LTE standard is an efficient means of communicating both data and control information between an enhanced base station (eNodeB, e.g., evolved Node B) and mobile user equipment (UE). The LTE PHY incorporates advanced technologies that are new to cellular applications. These advanced technologies include orthogonal frequency division multiplexing (OFDM) and multiple input multiple output (MIMO) data transmission. In addition, LTE-A uses OFDMA on the downlink and single-load 201234905 Wave Division Multiple Access (SC-FDMA) on the uplink. OFDMA allows data to be directed to or from multiple users for a specified number of symbol periods on a carrier-by-carrier basis. The 3GPP LTE Release 8 specification provides a set of frequency bands on which an LTE system can be deployed. The use of these bands can vary from country to country based on a universal frequency allocation strategy. Within the frequency band, the actual carrier frequency being used may also vary from one service provider to another. The 3Gpp USIM (umts User Identity Module) may only provide a list of PLMDIDs (Common Land Mobile Network Identification), which may include 3-bit Mobile Service Country Code (mcc) and 3-bit 7C Network Color Code (NCC) . However, the plMN id may not provide an indication of the frequency band to be used, and as such, it may not contain information about the particular carrier frequency on which the desired service provider is present. It is expected that user equipment (UE) operating within the LTE system will be aware of and maintain a list of adaptability of carrier frequency and frequency band information when successfully acquiring services from different countries and service providers. Therefore, the UE may be required to always perform a frequency scan while attempting an initial capture. SUMMARY OF THE INVENTION In one aspect of the present invention, a method for wireless communication is provided. The method generally includes monitoring, by a user equipment (UE), one or more parameters associated with the UE, and selectively discarding the received packet based on the one or more parameters to trigger a rate control mechanism within the UE. In the context of the present invention, an apparatus for wireless communication is provided. The apparatus generally includes for monitoring by the user equipment (UE) associated with the UE

6 S 201234905 One or more parameters of the component, placed and used based on the one or more parameter options. A device for wireless communication is provided in the configuration of the arrest rate control mechanism within the watch list. a setting of at least one (four) and "to at least one of the at least one processor, the at least one processor is generally configured to be associated with the UE by the user" or a plurality of parameters, and Based on the above, the parameter is selectively discarded to trigger the certificate control mechanism. In one aspect of the present invention, a computer program product for wireless communication is provided. Cold & include a non-instantaneous 1 readable media on which the code is stored. The code may be executed by - or a plurality of processors for monitoring by the user equipment (UE) Or a plurality of parameters and selectively discarding the received packet based on the one or more parameters to trigger a rate control mechanism within the UE. [Embodiment 3 Various aspects of the present invention use, for example, a setting and a System triggers such as memory and/or processing power can be used to trigger downstream key flow control at the user equipment (UE). Roots can be .# , according to various aspects, received the Internet Protocol (IP) packets can be encapsulated before being passed to the application processor Receiving classification information layer protocol (PCDP) is dropped in an effort to reduce the respective TCP (Tcm of transfer amount. Thus, the respective aspects of the case allows the UE to reduce the feed rate of the downlink depleted in an effort to enhance the user experience and release resources.

S 7 201234905 Bottom > See the attached drawings for a more complete description of the various aspects of the case. However, the present invention may be embodied in many different forms and should not be construed as being limited to any specific structure or function. For the sake of Xian, the provision of this aspect will make the case thorough and complete, and it will fully convey the scope of the case to those skilled in the art. Based on the teachings of the present applicant domain, it should be understood that the scope of the present application is intended to cover any aspect of the present disclosure disclosed herein, whether or not it is implemented independently of any other aspect of the present invention. . For example, the device or method of practice may be implemented using any number of aspects as set forth herein. In addition, the scope of the present invention is intended to cover the use of the means or methods of practice in the application of the various aspects of the present invention described herein, or other structures, functions, or structures and functions. It should be understood that any aspect of the present disclosure disclosed herein can be implemented by one or more elements of the claim. The use of "." is used herein to mean "serving as an example, instance, or illustration." Any aspect described herein as "exemplary" is not necessarily to be construed as preferred or advantageous. Although specific aspects are described herein, numerous variations and permutations of such aspects are within the scope of the present disclosure. Although some advantages and advantages of the preferred aspects are mentioned, the scope of the present invention is not intended to be limited to a particular benefit, use or target. Specifically, the various aspects of the present invention are intended to be broadly applicable to different wireless technologies, system configurations, networks, and transport protocols, some of which are described in the drawings and in the following description of preferred aspects. The detailed description and drawings are merely illustrative of the present invention, and the scope of the present invention is defined by the accompanying claims and their equivalents. 8 201234905 Exemplary Wireless Communication System The techniques described herein can be used in a variety of wireless communication networks, such as mega-multiple access (CDMA) networks, time-division multiplexed access (TDMA) networks, and crossover multiplex access. (FDMA) network, orthogonal FDMA (OFDMA) network, single carrier FDMA (SC-FDMA) network, and the like. The terms "network" and "system" are often used interchangeably. The CDMA network can implement radio technologies such as Universal Terrestrial Radio Access (UTRA), CDMA2000, and the like. UTRA includes Broadband-CDMA (W-CDMA) and Low Chip Rate (LCR) » CDMA2000 covers the IS-2000, IS-95 and IS-856 standards. The TDMA network can implement radio technologies such as the Global System for Mobile Communications (GSM). The OFDMA network can implement radio technologies such as Evolution UTRA (E-UTRA), IEEE 802.11, IEEE 802.16, IEEE 802.20, and Flash-OFDM®. UTRA, E-UTRA and GSM are part of the Universal Mobile Telecommunications System (UMTS). Long Term Evolution (LTE) is an upcoming release of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS, and LTE are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). CDMA2000 is described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). CDMA2000 is described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). Such various radio technologies and standards are well known in the art. For clarity, certain aspects of the techniques are described below for LTE, and LTE terminology is used in much of the description below. An access point ("AP") may be included, implemented as, or referred to as: a b-node, a radio network controller ("RNC"), an evolved Node B ("eNB"), a base 201234905 ground node controller (" BSC"), base transceiver station ("bts"), base station (BS) transceiver function ("TF"), radio router, radio transceiver, basic service set ("BSS"), extended service set (" ")", radio base station ("RBS")' or some other term. The access ', end (AT)) may include, be implemented as 'or as an access terminal, a subscriber station, a subscriber unit, a mobile station, a remote station, a remote terminal, a user terminal, a user agent, User device, user equipment ("ue"), user station, or some other terminology. In some implementations, the access terminal may include a cellular phone, a wireless phone, a communication start-up ("Shen") phone, a wireless zone loop ("祖") station, a personal digital assistant ("PM"), with wireless A handheld device, station ("sta"), or some other suitable processing device connected to a wireless modem. Accordingly, the one or more aspects taught herein can be incorporated into a telephone (eg, a cellular or smart phone), a computer (eg, a laptop), a portable device: a device, A portable computing device (eg, a personal data assistant), an entertainment device (eg, a music or video device, or a satellite radio), a global positioning system device, or any other suitable device configured to communicate via wireless or wired media. In some aspects, the node is a wireless node. Such wireless nodes may provide connectivity or provide connectivity to the network (e.g., a wide area network or a cellular network such as the Internet), such as via a wired or wireless communication link. Referring to Figure 1, a multiplexed access line communication system in accordance with the present invention is illustrated. The access point 1A (Ap) may comprise a plurality of antenna groups, one group comprising antennas 104 and 1G6, the other group comprising antennas (10) and u〇. 201234905 and the other group comprising antennas 112 and 114 . Only two antennas are illustrated for each antenna group in Figure 1, however, each antenna group may utilize more or fewer antennas. The access terminal 116 (ΑΤ) can be in communication with the antennas (1) and ... wherein the days, lines 112 and 114 transmit information to the access terminal m on the forward link 12A and receive on the reverse link U8. The information of the terminal 116 is accessed. Access terminal 122 can be in communication with antennas 〇6 and (10) where antennas 106 and 〇8 transmit information to access terminal m on forward link 126 and receive access from reverse link 124. Information of the terminal 122. In the FDD system, the communication links ιΐ8, 12〇, and 126 can communicate using different frequencies. For example, the forward link (4) can use a different frequency than that used by the reverse link 118. Each group of antennas and/or the area in which they are designed to communicate is often referred to as: access point (four) ^ In this (four) - aspect, each antenna group can be designed to be just covered by the access point Access terminal communication in the sector of the area. In the communication to the links 120 and 126, the access point 1〇〇 can be beamformed to improve the signal-to-noise ratio of the monthly J-way of the different access terminals 116 and 124. In addition, the access point uses beamforming to transmit to the neighboring cell service area to the access terminals randomly distributed throughout its coverage, as compared to the access point transmitting to its access terminal via a single antenna. The interference caused by the terminal is less. * A block diagram of the aspect of the transmitter system 21 (also known as the access point) and the receiver system 25 (also referred to as access ', 鳊) in the multiple input multiple output (ΜΙΜΟ) system 200 is shown. At the transmitter system 210, traffic data is transmitted from the source 11 12, 2014, 905 source 2 12 to the (τ χ) data. The processor 214 provides a plurality of data streams. In the case of the present case, each data stream can be transmitted on its respective transmitting antenna. ΤΧ Data Processing $ 214 is based on selecting (4) a coding scheme for each data stream to format, encode, and interleave the data stream of the data stream to provide encoded data. The encoded data for each data stream can use the FDM technique to multiply the pilot data. The pilot data is typically processed/known in a known manner and can be used at the system to estimate channel response. The multiplexed pilot and channel of the data stream are then modulated (i.e., symbol mapped) based on a particular modulation scheme (e.g., bpsk, QPSK, M-PSK, or M-QAM) selected for each data stream. Encode the data to provide modulation symbols. The data rate, coding and modulation for each data stream can be determined by instructions executed by processor 23A. The modulation symbols for all data streams are then provided to the τ χ MlM 〇 processor 220' which may further process the modulation symbols (e.g., for OFDM). The processor 220 then provides a stream of modulated symbols to the transmitters (TMTR) 222a through 222t. In some instances of the present disclosure, TX MIMO processor 220 applies the beamforming weights to the symbols of the data streams and to the antennas that transmit the symbols. Each transmitter 222 receives and processes a respective symbol stream to provide one or more analog signals, and further conditions (e.g., amplifies, sweeps, and upconverts) the analog signals to provide for transmission on a chirp channel. Modulated signal. The ... modulated 12 201234905 signals from transmitters 222a through 222t are then transmitted from jvr antennas 224a through 224t, respectively. At the receiving 1 § system 250, the transmitted modulated signals can be received by the antennas 252a through 252r, and the signals received from each of the antennas 252 can be provided to respective respective receivers (RCVR) 254a through 25 buckle. Each receiver 254 can condition (e.g., filter, amplify, and downconvert) respective received signals, digitize the adjusted signals to provide samples, and further process the samples to provide corresponding "received" Symbol stream. The RX bedding processor 26 then receives the % received (four) streams from the % receivers 254 and processes them based on a particular receiver processing technique to provide ~ "detected" symbol strings. The RX data processor then demodulates, deinterleaves, and decodes each detected symbol stream to recover the traffic data for that stream. The processing by RXf processor 26G may be complementary to the processing performed by τ χ MIM 〇 processor no and τ χ data processor 214 at transmitter system 210. The processor 270 periodically determines which precoding matrix to use. The processor 270 formulates the reverse keyway reverse link information including the matrix index portion and the rank value portion to include various types of information related to the communication link and/or the received data stream. The reverse link message is then processed by the data processor 238, which also receives the data stream of the plurality of data streams from the data source 236, modulated by the modem 280, adjusted by the transmitters 254a through 2Mr, and transmitted back to the transmitter. System 210. . At the transmitter system 210, the modulated signal from the receiver system 25A is received by the antenna 224, adjusted by the receiver 222, demodulated by the demodulator 24 and & RX data processing $ 242 processing to extract Receiver system 250 13 Ιϋ 201234905 The reverse link message. The processor 23 then decides which pre-flat code matrix to use to determine the beamforming weights and then processes the extracted information. Figure 3 illustrates the wireless available in the wireless communication system from the map. Also available are various components that can be used in 302. Wireless device 3.1 is an example of a device that can be configured to implement the various methods described herein. The wireless device 3〇2 may be any access terminal from the access point ι of Figure j or the access terminals us, u2. Wireless device 302 can include a processor 304 that controls the operation of wireless device 302. The processor 3〇4 may also be referred to as a central processing unit (CPU). Memory 3〇6, which may be referred to as both δ ** (R_〇M) and random access memory (RAM), provides instructions and data to processor 〇4. A portion of the memory may also include non-volatile random access memory (NVRAM). The processor 〇4 typically performs logical and arithmetical arithmetic based on program instructions stored in the memory 〇6. The instructions in memory 306 may be executable to implement the methods described herein. The wireless device 302 can also include a housing 3〇8 that can include a transmitter 310 and a receiver 312 to permit transmission and reception of data between the wireless device 302 and a remote location. Transmitter 31 and receiver 312 can be combined into transceiver 314. Single or multiple transmit antennas 316 can be attached to and coupled to transceiver 314. The wireless device 3〇2 may also include (not shown) multiple transmitters, multiple receivers, and multiple transceivers. The wireless device 302 can also include a signal detector 318 that can be used to attempt to detect and quantify the level of signals received by the transceiver 314. The signal detector 318 201234905 can detect signals such as total energy, energy per symbol per symbol, power spectral density, and other signals. Wireless device 302 can also include a digital signal processor (DSP) 320 for processing signals. In some aspects, wireless device 302 can include one or more monitors', such as temperature monitor 32i. Temperature monitor 321 is configured to measure the temperature of one or more components of wireless device 302 (e.g., a power amplifier, not shown). Although the monitor is not shown in Figure 3 as a temperature monitor 3 2 1 'Imagine some of the miscellaneous samples of this case may utilize other suitable monitors, including but not limited to CPU monitors and memory monitors' which have One or more respective sensor elements that detect one or more UE parameters or metrics. The various components of the wireless device 302 can be coupled by a busbar system 322 in addition to a data busbar 322. The busbar system 322 can also include a power bus, a control signal bus, and a status signal bus. Some aspects of the present invention are supported for performing frequency sweeps by user mobile devices (such as access terminals 116, 122 from Figure 1, access terminal 25 from Figure 2, and wireless device 3〇2 from Figure 3). The method of aiming. In one aspect, frequency scanning can be performed without any prior information capture at the mobile device, which can be referred to as full frequency scanning (FFS). In another aspect, the frequency sweep can be performed using the prior successful capture information stored on the mobile device, which can be referred to as List Frequency Sweep @(LFS). The proposed frequency sweep algorithm (also #ffs > lfs) can be supported by both the 3GPP LTE system and the time division duplex (FDD) mode or the time division duplex (tdd) mode to support both TDD and TDD modes of operation. LTE Downlink Flow Control 15 201234905 Because of resource limitations at the UE, in some cases, it is desirable for downlink flow control to regulate how the application subsystem receives and processes data packets. System triggers such as, for example, memory size, processing power, and/or acceptable device temperature can be used to trigger downlink flow control. Various techniques are described herein with reference to an LTE network, which is a specific, non-limiting example of a network in which such technologies may be used. However, those skilled in the art will appreciate that such techniques can be more commonly applied to various types of wireless networks. When flow control is triggered, the UE may selectively drop the packet to control the Transmission Control Protocol (TCP) transmission amount in an effort to release resources at the UE. The packet can be selectively discarded at the Packet Data Convergence Protocol (PDCP) layer before it is passed to the application layer. As will be described in greater detail below, the UE may implement efficient buffer management to trigger a rate control mechanism in an effort to control the downlink flow. Rate control may be performed by a threshold based party including centralized flow control). By triggering a rate control mechanism at the UE, buffer management can be performed closer to the honeyspot source and can allow downlink rate control without having to use additional network diagrams in accordance with various aspects of the present exemplary system architecture 4_eNB may The machine processor 404 transmits the packet to the number of ue via a communication link such as the LTE link 4〇6. The modem processor can send packets to the application (4) 8 for transmission. The Tcp client can send a TCP acknowledgement and/or a negative acknowledgement to 412. Although the programmer can receive packets at any rate,

S 16 201234905 In some cases, the speed at which it processes the received packets may not be as fast as the arrival of the packets on the LTE link 406. The downlink flow control methods described herein may be implemented to help release resources at the UE, depending on the context' because the data may be lost when the buffer at the UE reaches the complex capacity. For example, it is desirable to set a threshold for the buffer in an effort to avoid short burst data loss and temporary timeout of TCP. The buffer threshold may depend on the application; the #k π processor 408 processes the rate at which the data is received. As will be described in more detail below, (10) an interface can be provided to the application processor to determine the desired rate. For example, an application programming interface (ΑΡΙ) may allow the application processor 408 to provide the data processor 404 with a desired processing rate when the field is provided 'this desired rate can be used for tuning—or multiple hanger thresholds and/or packets. I abandon the rate. According to various aspects, the UE can implement centralized downlink key flow control. The centralized flow control can be triggered based on memory related parameters (eg, if the UE begins to use full office memory). When the UE has too much data stored in the upstream and downstream key buffers, the UE can begin to run out of memory, such as a decentralized shared memory (10) M) entry. According to various aspects of centralized flow control, the UE may discard the TCP packet. For example, ue may periodically drop Tcp packets based on a preset time period. The predetermined time period can be specified by a dynamic algorithm. The algorithm will be described in more detail below. Circle 5 does not illustrate the inter-value based flow control according to various aspects of the present case. $(9) ^ W ° The T-line link packet received by the UE can reach the PDCP layer 502 of the modem subsystem 508. Depending on the aspect, the application subsystem 504 may not process the received packet (e.g., successfully received as received)

S 17 201234905 package). Depending on the aspect, one or more thresholds may be set such that the delay on the receive path is below a threshold. For example, the threshold ensures that the delay between Radio Link Control (RLC) and Application Subsystem 5〇4 is less than a value (e.g., 8 〇 milliseconds). When the buffer reaches a value of 5 〇 6, the UE can periodically discard the packet to reduce the TCP window size. Depending on the aspect, when the buffer reaches threshold 506, the PDCP layer can selectively discard the received packet. Depending on the aspect, selectively discarding packets can occur before the packets are passed from the modem to the application processor. The dropped packets will not be received at the application subsystem 5G4 or client. Therefore, a packet that is discarded at the application layer may indicate that the TCP layer may need to reduce its rate. When the TCP client does not receive the dropped packet, the Tcp client may send a TCP Negative Acknowledgement (NACK) to the TCP Feeder and/or a duplicate acknowledgement of the previously received packet. Such negative acknowledgments and/or repeated acknowledgments of previously received packets may result in a reduction in the size of the TCP window thereby reducing the amount of Tcp transmission. Correspondingly, the load on the PDCP layer can be reduced. Figure 6 illustrates an example 600 of centralized downlink flow control based on parameters monitored at the UE. Depending on the situation, one or more parameters can be monitored, including temperature-related parameters, processing power-related parameters, and/or memory-related parameters. For example, temperature monitor 602 can observe the temperature of one or more devices (including, for example, 'dataphones and batteries') at the UE. Depending on the situation, since the battery overflow is usually related to the uplink transmit power, the temperature monitor _ can observe that the uplink data rate has been connected to a rate (for example, most

Battery temperature after S 18 201234905 large or minimum rate). The DSM monitor 604 can observe the available global memory at the UE by observing the DSM item availability. The centralized flow control module (CFM) 606 can determine whether to trigger a downlink flow based on one or more parameters received from one or more monitors or sensors (eg, temperature monitor 602 and DSM monitor 604). control. As described above with respect to Figure 5, PDCP layer 502 can periodically discard packets based on observed parameters to reduce the TCP window size. Depending on the aspect, based on the temperature of the device at the UE, processing power usage and/or memory usage (e.g., the number of DSM items), CFM 606 may indicate that 1 PDCP layer 502 adjusts the rate at which packets are dropped. Adjusting the rate at which packets are dropped can trigger a rate control mechanism at the UE. For example, a high battery or data temperature and/or a limited number of DSM entries may indicate that the PDCP layer should increase the rate at which packets are dropped in an attempt to reduce the downlink flow. Thus, UE TCP NACK and/or duplicate acknowledgments can be increased, which can result in a reduction in TCP window size thereby providing downlink rate flow control. At 608, the packet discard rate can be updated based on the received indication from CFM 606. The updated discard rate adjusts the rate at which packets are dropped from the PDCP layer and thus adjusts the rate at which packets are buffered at 610. Depending on the aspect, PDCP packets larger than a predetermined size may be selectively discarded when CFM 606 triggers downlink flow control. The predetermined size can be selected to be larger than the size of the intended control packet. Selectively dropping only packets larger than, for example, 200 bytes ensures that TCP acknowledgments are not discarded. By not discarding packets below the predetermined threshold, including TCP acknowledgments, the UE can ensure that dropped packets have an impact on downlink flow control. 19 201234905 Figure 7 Figure # shows an example of a downlink key flow control method 700 in accordance with various aspects of the present invention. As previously described, in some cases, application processor 408 can provide the data machine with a desired rate of receiving data. AH may allow application processor 4〇8 to provide a desired processing rate to the data machine subsystem. When provided, the desired rate can be used to tune the buffer threshold and the packet discard rate. For example, the application processor 4〇8 may determine the desired target rate 702 and communicate the rate to the pDcp layer 502 of the modem subsystem. In this case, the UE may not need to dynamically adjust the discard rate of the pDcp packet. The UE may instead adjust the buffering of the packet based on the desired output target rate of the application processing @4〇8. The parameters associated with downlink flow control can be calculated using the desired output target rate of the application processor. According to various aspects, after the application processing reaches the first value T1, one of every n packets can be discarded according to the following function.

Tl = rate *nt

”=2*rate*m/MSS The value of T1 can be calculated based on the expected output rate of the application processor and the tcp round trip time (10). The TCp round trip time may not be available at the p(10) layer. Therefore, 'depending on each aspect, The UE may determine the round trip based on, for example, the cumulative distribution function of Tcp in the back travel time. In one case, the 'round trip between the rows may be set to the worst case m. In another: the barrier: the middle may not exceed a value' such as 200 milliseconds, and can be set to] such as 60 milliseconds. However, other values can be used.

S 20 201234905 The UE may determine the number η of blocks c to be discarded after the inter-value τι is reached based on the rate provided by the application processor, the stagnation and the maximum tcp segment size (10) s). According to various aspects, "" can be set to a value such as 1400 bytes. However, other values can be used. According to various aspects, after reaching the second threshold Τ2胄, all incoming packets can be discarded. The second threshold Τ2 may indicate the maximum amount of data that can be stored in the buffer. Therefore, after the threshold Τ2 is reached, all incoming packets can be discarded. For example, if the previous flow control method did not release sufficient resources at m, the buffer may reach the second threshold T2. Depending on the aspect, the value T2 can be any value greater than (eg, sufficiently greater than) the threshold τι. Depending on the aspect, if the application processor has not yet raised the rate, the target rate can be selected based on the available information. = The selected target rate can be used to calculate T1, T2, and/or". Circle 8 illustrates an example 800 of buffer threshold based flow control in accordance with various aspects of the present case. At 8〇2, traceable application processing The target output rate of the device. The rate can be determined by the application and transmitted to the data machine' or the 1 (four) rate can be estimated based on the available information at the UE. The parameter ^(7) for downlink flow control can be calculated at 804 and /or". According to various aspects, you can calculate ΤΠ using a delay D, _, use the coefficient K1 to calculate W ’, and use the coefficient K2 to calculate T2. At 806, thresholds T1 and T2 can be used as thresholds to trigger downlink flow control at the pDcp layer. For example, when the buffer reaches the threshold ^, there are (five) packets that can be discarded. These packets can be discarded before being passed from the modem to the application processor. If the (10) punch smells

S 21 201234905 T2’ All incoming packets from the modem can be discarded. . The packet passed from the modem to the application processor can be slowed down in (4)

According to various aspects, the average delay observed by the packets in the PDCp buffer 81A can be used to trigger downlink flow control. For example, if the PDCP layer observes that the packet remains in the ρηΓ1ΰ μ DCP buffer for 900 milliseconds, the downlink flow control can be triggered. The average rate at which the program processor reads data from the PDCp buffer 8(7) can be used to trigger the downlink mm, and the amount of unread data in the buffer that the poem transfers data from the PDCP layer to the application processor can be used to trigger the downlink. Link flow control. Based on the amount of unread data in the buffer and/or the rate at which the application processor reads data from the buffer, the UE can adjust the buffer size and/or packet discard rate to achieve the desired target rate at the application processor. Additionally or alternatively, the amount of time that unread material is in the buffer can be used to trigger downlink flow control. ® 9 does not illustrate exemplary operations that may be performed, for example, for downlink flow control, according to various aspects of the present disclosure. At 9〇2, ue^ monitors one or more parameters associated with the UE. At 9.4, the received packet can be selectively discarded based on the one or more parameters to trigger a rate control mechanism in ue. These packets can be discarded at the pDCp layer before being passed to the application layer. Various aspects of the present invention provide techniques for downlink machine control based on parameters observed at the UE. As described herein, packets may be selectively discarded at the pDCp layer in an effort to reduce the corresponding Tcp layer throughput. Packets dropped at the pDCp layer will not reach the application processor. Accordingly, the TCp client 22 201234905 may send a negative acknowledgment to the TCP server and/or a duplicate acknowledgment of the previously received packet to trigger downlink flow control. According to various aspects, downlink flow control may be triggered by one or more parameters associated with the UE, such as, for example, temperature of one or more devices at the UE, available global memory, in the buffered CP buffer The delay observed by the packet, and/or the rate at which the application processor processes the data from the PDCP layer. Based on these parameters, the UE can fine-tune the rate at which the packet is discarded at the PDCP layer. The various operations of the methods described above can be performed by any suitable means capable of performing the corresponding function 2. The components may include various hardware and/or software components and/or molds, including but not limited to circuits, special application integrated circuits (10) or processors, as illustrated in the drawings. These operations may have corresponding pairing means functional elements with similar component symbols. Ding / As used in this article, the term "decision" covers a wide variety of actions. For example, "Decision" can be used in Xiao Cup. 瞀 瞀 括 肩 计 计 计 计 计 计 计 计 计 计 计 计 计 计 计 计 计 计 计 计 计 计 计 计 计 计 计 计 计 计 计 ( ( ( ( ( ( ( ( ( ( ( ( Indeed, and similar actions. Moreover, "decision" may include receiving (eg, receiving: information), accessing (eg, 'accessing data in memory'), and the like, and determining may also include parsing, selecting, selecting, establishing, and the like. action. As used herein, the term "at least one" in a list of items refers to any combination of the items, including individual members. At least one of the strengths ab or C is intended to cover: a, b, c, Ab, 23 201234905 ac, bc ' and abc. The various operations of the methods described above can be performed by any suitable means capable of performing such operations, such as various hardware and/or software components, circuits, and/or modules. In general, any of the operations illustrated in the figures can be performed by corresponding functional components capable of performing such operations. Various illustrative logic blocks, modules, and circuits described in connection with the present invention may be implemented by general purpose processors, digital signal processors (DSPs), special application integrated circuits (ASICs), field programmable gate array signals (FPGA), or the like. Program logic devices (PLDs), individual gate or transistor logic, individual hardware components, or any combination thereof designed to perform the functions described herein are implemented or executed. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine. The processor can also be implemented as a combination of computing devices, e.g., a combination of a Dsp and a microprocessor, a plurality of microprocessors, one or more microprocessors in coordination with a DSP core, or any other such configuration. The steps of the method or algorithm described in connection with the present invention can be implemented directly in hardware, in a software module executed by a processor, or in a combination of the two. The software modules can reside in any form of storage medium known in the art. Some examples of storage media that may be used include random access memory (RAM), read only memory (R〇M), flash memory, EpR〇M memory, EEPROM 5 memory, scratchpad, hard Discs, removable discs, and more. A software module can include a single instruction, or a number of instructions, and can be distributed across several different code segments, distributed among different programs, and distributed across multiple storage media. The storage medium can be coupled to the processor such that 24 201234905 the processor can read information from and write information to the storage medium. Alternatively, the storage medium can be integrated into the processor. The methods disclosed herein comprise one or more steps or actions for achieving the methods described. The method steps and/or actions may be interchanged with one another without departing from the scope of the claims. In other words, the order and/or use of specific steps and/or actions may be modified without departing from the scope of the claims. The functions described can be implemented in hardware, software, firmware or any combination thereof. If implemented in software, each function can be stored as a - or multiple instruction memory on a computer readable medium. The storage medium can be any available media that can be accessed by the computer. By way of example and not limitation, such computer readable::: includes RAM, R〇M, EEPR〇M, CD-R〇M or other optical ', device, disk storage or other magnetic storage device Or any disk that can be used to carry or store the desired code in the form of an instruction or data structure and that can be accessed by the computer, such as the disk disc d) used herein, includes a dust-reducing disc ( CD), laser discs, compact discs, digital versatile discs (DVDs), floppy discs and m discs, in which discs (d calls often magnetically reproduce data, discs (dise) w to optically reproduce data. Brain = Some aspects may include computer programs for performing the operations provided herein. For example, 'such computer program products may include computer readable media on which instructions are stored (and/or encoded), such instructions It can be executed by one or more ::: to perform the operations described herein. For some aspects of computer program products, packaging materials can be included. Software or instructions can also be transmitted on a transmission medium. For example, if the software is 25 201234905 Use coaxial cable, fiber optic cable Twisted pair, digital subscriber line (DSL), or wireless technology such as infrared, radio, and microwave transmission from a website, server, or other remote source, the coaxial cable, fiber optic cable, twisted pair, DSL , or wireless technologies such as infrared, radio, and microwave, are included in the definition of the transmission medium. Furthermore, it should be appreciated that modules and/or other suitable components for performing the methods and techniques described herein can be utilized. The terminal and/or base station are downloaded and/or otherwise obtained where applicable. For example, the device can be coupled to a server to facilitate the transfer of components for performing the methods described herein. The various methods described can be provided via a storage component (eg, RAM, ROM, physical storage media such as a compact disc (CD) or floppy disk, etc.) such that the storage member is coupled or provided to the user After the terminal and/or the base station, the device can obtain various methods. Furthermore, it is possible to utilize the methods and techniques described herein for providing the device. Any other suitable technique. It should be understood that the claims are not limited to the precise configurations and elements illustrated above. Various modifications, replacements, and changes may be made in the layout, operation, and details of the methods and apparatus described above. Variations without departing from the scope of the claims. Although the above is directed to the various aspects of the present invention, other and further aspects of the present invention may be devised without departing from the basic scope and the scope thereof [Description of Schematic] 26 201234905 In order to make a detailed understanding of the structural features stated above in this case, we can refer to the various aspects to make a more specific description of the content of the above brief overview. The drawings are illustrated in the drawings, however, it should be noted that the drawings are only illustrative of certain aspects of the present invention and should not be construed as limiting.示例 0 illustrates an exemplary multiplex access wireless communication system in accordance with various aspects of the present disclosure. Figure 2 illustrates a block diagram of an access point and user terminal in accordance with various aspects of the present invention. FIG. 3 illustrates a block diagram of an exemplary wireless device in accordance with various aspects of the present disclosure. FIG. 4 illustrates an exemplary system architecture in accordance with various aspects of the present disclosure. Circle 5 illustrates an example of a buffer threshold based downlink flow control scheme in accordance with various aspects of the present disclosure. The figure illustrates an example of a medium-sized downlink flow control based on monitored parameters in accordance with various aspects of the present disclosure. Figure 7 illustrates an example of downlink flow control in accordance with various aspects of the present disclosure. Figure 8 illustrates an exemplary algorithm for downlink flow control in accordance with various aspects of the present disclosure. Figure 9 illustrates an exemplary operation performed in accordance with various aspects of the present invention, such as by a UE, for downlink flow control. [Main component symbol description] 100 access point CAP) 27 201234905 104 Antenna 106 Antenna 108 Antenna 110 Antenna 112 Antenna 114 Antenna 116 Access terminal 118 Reverse link 120 Forward link 122 Access terminal 124 Reverse link 126 Forward link 200 Multiple Input Multiple Output (ΜΙΜΟ) System 210 Transmitter System 212 Source 214 Transmit (ΤΧ) Data Processor 220 ΤΧ ΜΙΜΟ Processor 222a Transmitter (TMTR) 222t Transmitter (TMTR) 224a Antenna 224t Antenna 230 Processor 236 Source 238 TX Data Processor

28 S 201234905 240 Demodulator 242 RX Data Processor 250 Receiver System 252a Antenna 252r Antenna 254a Receiver (RCVR) 254r Receiver (RCVR) 260 RX Data Processor 270 Processor 280 Modulator 304 Processor 306 Memory 308 Enclosure 310 Transmitter 312 Receiver 314 Transceiver 316 Transmitter Antenna 318 Signal Detector 320 Digital Signal Processor (DSP) 321 Temperature Monitor 322 Bus Bar System 400 System Architecture 402 Evolutionary Node B (eNB) 404 Data Processor 29 201234905 406 LTE Link 408 Application Processor 410 TCP Client 412 TCP Server 500 Threshold Based Flow Control 502 Packet Data Convergence Protocol (PDCP) Layer 504 Application Subsystem 506 Threshold 508 Data Machine Subsystem 600 Centralized Downlink Example of flow control 602 Temperature monitor 604 DSM monitor 606 Centralized flow control module (CFM) 608 Step 610 Position 700 Downlink flow control method. 702 Target rate B00 Example of flow control based on buffer threshold § 02 Step 804 Step § 06 Step § 10 PDCP Buffer 900 Exemplary Operation 902 Steps

30 S 201234905 Step 904 31

Claims (1)

201234905 VII. Patent application scope: The following steps are included: UE related-or multiple parameters; L A method for wireless communication, monitored by the user equipment (UE) and selected based on the one or more parameters A rate control mechanism that discards the packets into the packet. The method of triggering the UE month claim 1, wherein the step of selectively packetizing based on the one or more parameters comprises the step of: adjusting a rate at which the packets are discarded. The method of claim 1, wherein the step of selectively discarding the received packet based on the one or more parameters comprises the steps of: periodically periodically buffering a packet to reduce a Transmission Control Protocol (TCP) window The method of claim 1, wherein the step of selectively discarding the packet based on the _ or a plurality of parameters comprises the following steps: a packet data convergence protocol (PDCP) layer selectively discards the packet 6 low- The packet is reduced by the transmission control protocol (TCP) layer. 5. The method of claim i, wherein the step of receiving the packet includes the following steps based on the one or more parameters of the silkworm, and the following steps are included: 32 201234905 Selectively lost only female # A packet having a value greater than a predetermined size. 6. The method of claim 44, wherein the predetermined size is selected to be a size of the control packet. The method of claim 1, wherein the one or more parameters comprise: temperature or at least 8 of a temperature of a device on the UE, such as a method of requesting item 1, The one or more parameters include: at least one of a memory related parameter or a processing power related parameter. The method of claim 1, wherein the one or more parameters comprise: a buffer for transferring the resource from the packet data convergence protocol (PDCP) layer to an application processing buffer. At least one of the amount of unread data or unread data at a time in the buffer. 10', as in the method of claim 1, the one or more parameters include: the processor is used to buffer data from a packet data convergence protocol (PDCP) layer value sa to a buffer of the application processor The rate at which the device reads the data. 11 · If the method of requesting τ Λ 10 10, further comprises the following steps: Dynamic adjustment number · Red one 的 的 的 的 或 或 或 或 或 或 或 或 或 或 。 。 。 至少 至少 至少 至少 至少 至少 至少 至少 至少 至少 至少 至少 至少 至少 至少 至少 至少 至少 至少 。 。 The method of claim 1, wherein the one or more parameters comprise a rate of the data processor from the application processor via the application. For, ° the η. as requested! The method wherein the step of selectively discarding the received packet occurs prior to the step of transferring the packets from the data machine to the application processing test. 14. An apparatus for wireless communication, comprising: a user equipment (4) means for monitoring one or more parameters associated with the addition; and for selectively selecting a parameter based on the -3⁄4 A. AX The component that receives the packet with a rate control mechanism in the UE is discarded. 15. The apparatus of claim 14, the means for receiving the packet directly, based on the received parameter, comprises: means for adjusting the rate of discarding the packet. member. 16. The apparatus of claim U, the selectively discarding the structure of the received packet = for periodically discarding the packet of the size of the packet based on the - or more parameters. </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> <RTIgt; : Multiple parameters are used to selectively discard a corresponding component of the Control Protocol (TCP) layer in a Packet Data Convergence Protocol (PDCP) layer. a device of claim 14 wherein the means for packetizing based on the selectively (four) (four) comprises: a parameter for selectively selecting a packet that is larger than a packet of a predetermined size. 19. The request item 18 + #w, the apparatus, wherein the predetermined size is selected to be greater than a size of an expected control packet. The device of claim 14 is more than the device of claim 14, wherein the one or more parameters of the UE are one of the UE, or the temperature of the device, or a temperature of a device on the UE. The device of item 14, wherein the one or more parameters comprise: at least one of a &quot;body related parameter or a processing power related parameter. 2 2 · If you want to table ^ sniffing 14 device, the one or more parameters include: used to transfer the slaves from a package data convergence agreement (PDCP) layer to a program to handle crying &amp; At least one of an unread amount of data or an unread material in a buffer for a time in the buffer &amp;&amp; 35 201234905 23. The device of claim 14, wherein the - or the plurality of parameters comprises: the heart processor reads from a buffer for transferring data from a packet data convergence protocol to the application processor A rate of data. 24. The apparatus of claim 23, further comprising: means for dynamically adjusting a size of the buffer or adjusting the rate to at least one of a desired target rate. 25. The apparatus of claim 14, wherein the one or more parameters comprise a rate provided by the application-writing interface 35 to a data machine of the UE by the application programming interface. 26. The apparatus of claim 14, wherein selectively discarding the received packet occurs prior to transferring the packet from the data machine to the application processor. 27. An apparatus for wireless communication, comprising: at least one processor configured to: monitor, by a user equipment (UE), one or more parameters associated with the UE; and select based on the one or more parameters The received rate control mechanism is discarded; and the triggering a delta memory is coupled to the at least one processor. 36 201234905 28. The research proceeds to claim 27, wherein the at least one processor is configured to selectively discard the received packet based on the one or more parameters via: A: A device of the second embodiment, wherein the at least one processor is configured to selectively discard the received packet based on the one or more parameters by: periodically terminating the master Encapsulating to reduce a Transmission Control Protocol (TCP) window size/J\ 〇, wherein the at least one processor is configured to be left by the following operation to select based on the one or more parameters Scratching the received packet: - The Packet Data Convergence Protocol (PDCP) layer selectively discards the packet to reduce - the corresponding Transport Control Protocol (TCP) layer transmission. "A device such as the Kiss 27, wherein the at least one The processor is configured to selectively discard the received packet based on the one or more parameters by: selectively discarding packets that are only larger than a predetermined size. 32. The apparatus of claim 31, wherein the predetermined size is selected to be greater than a size of a 37 201234905 expected control packet. 33. The device of claim 27, wherein the one or more parameters comprise: at least one of a temperature of the UE or a temperature of a device on the UE. 34. The device of claim 27, wherein the one or more parameters comprise: at least one of a memory related parameter or a processing power related parameter. 35. The apparatus of claim 27, wherein the one or more parameters comprise: an unread amount of data used to pass data from a packet data convergence protocol (PDCP) layer to a buffer of an application processor Or at least one of the amount of unread material in the buffer for a time. The device of claim 27, wherein the one or more parameters comprise: an application processor from a buffer for transferring data from a Packet Data Convergence Protocol (PDCP) layer to the application processor A rate at which data is read. 37. In the case of the request 36, the #中续$少_如占罝甲忑 main processor is further configured to: dynamically adjust the buffer-size or the material in the H-rate rate At least one. 38 201234905 38. An application of claim 27 $租¥#丄, the one or more parameters including a rate by the UE application processor via the application-data machine. Write the &quot; face to the 39. If the request is 27, the tribute to the package, you h, &quot;&quot; selectively discard the received packet before passing it from a modem to an application processor occur. 4. A computer for wireless communication includes a copy of it... The computer program package has code - a non-transitory computer readable medium that can be executed by one or more processors to: The equipment (UE) monitors - or a plurality of parameters associated with the UE - or the plurality of parameters selectively discards a rate control mechanism that receives the packet order. The computer program product of claim 40, wherein the gamma for selectively discarding the received packet based on the one or the semester includes: a code for adjusting a rate at which the packets are discarded. The computer program product of claim 40, wherein the code for selectively discarding the received packet based on the one or the parameter comprises: for periodically abandoning the packet to reduce a Transmission Control Protocol (TCP) window size Code. 39 201234905 wherein the code for selectively discarding the received packet based on the one or 43 computer program product of claim 40 includes: for selective use in a packet data convergence protocol (PDCP) layer The code that discards the packet to reduce the amount of transmission control protocol (TCP) layer transmission. 44. The computer program product of claim 4, wherein the code for selectively discarding the received packet based on the one or more parameters comprises: code for selectively discarding packets that are only larger than - a predetermined size. 45. The computer program product of claim 44 wherein the predetermined size is selected to be greater than - a size of the expected control packet. 46. The requesting item comprises: a computer program product of the UE, wherein the parameter or the wrinkle or at least one of a temperature of a device on the UE The memory related parameter or at least one of the one or more parameter packets - processing power related parameters. 48. The request item 4 includes: for transferring the undergraduate from a computer program product of the 40, wherein the one or more parameter packet data convergence protocol (PDCP) layer is transferred to the buffer of the 201234905 &quot; At least one of the amount of unread data or unread data in the buffer-time amount. 49. The computer program product of claim 40, wherein the one or more parameters are: an application processor buffering from a layer to a packet data convergence protocol (PDCP) layer to the application processor The rate at which the device reads. 50. The computer program product of claim 49, further comprising: code for dynamically _ | the buffer # - size or adjusting the rate to at least one of a desired target rate. The computer program product of item 40, wherein the one or more parameters comprise a rate provided by an application processor of the UE to a data machine of the UE via an application programming interface. 52. The computer program product of claim 4, wherein selectively discarding the received packet occurs prior to transferring the packet from a data machine to an application processor.